Which of the following describes the inner core of Earth? A
It is loose, primarily composed of silica particles, is under the least amount of pressure, and is between 70 and 200 kilometers thick.

B
It is dense, composed primarily of solid iron, is under the most pressure with the highest temperatures, and is 1250 kilometers thick.

C
It is solid, made up of magnesium and iron, has the lowest temperatures of any layer, and is 2900 kilometers thick.

D
It is made up of mainly of silicon and aluminum, has moderate temperatures, and is only 200 kilometers thick.